Some thought on my water quality

[moneyman]

I have a 130 Vista Corner reef. My water quality is as follows:

Temp 78
PH 8.0-8.1
KH 9.6dKH 3.43 meg/L
NH4 - 0
No2 - 0
No3 - <2ppm

Calcium - 350
Magnesium - 1250

Having some difficulty getting Calcium back up to my normal range of 430 -450

I dose with Oceans Blend 2 part. 50ml each in equal doses.I recently bought a new calcium, when it was sent it had a little sticker on it to add 8 cups RO/DI (looked like it was concentrated) however, my original bottle didn't seem to be concentrated
Any help would be appreciated? Thanks